Rename Games

I have folders on my external HDD, such as (Game Title) (Game ID) - I renamed the folder itself and that worked. But I would like to be able to add : in the game name, and windows does not allow that.

Is there a way to rename the game via Wii Backup Manager? I double clicked on the game name after enabling custom titles, but it had no effect. Did I do something incorrectly? Any help would be appreciated.